Academic Calendars: Undergraduate Fall 2025 OU OnlineUndergraduateFall 2025Academic Calendars Online Fall A: August 25 to October 17 (8 Weeks) Event/ActivityDateApplication DeadlineAugust 11Classes StartAugust 25Last day to add without the instructor’s permissionAugust 27Last day to drop & receive 100% refundAugust 29Labor Day Holiday: No Live SessionsSeptember 1Classes EndOctober 17Grades DueOctober 21 Online Fall B: October 20 to December 12 (8 Weeks) Event/ActivityDateApplication DeadlineOctober 6Classes StartOctober 20Last day to add without the instructor’s permissionOctober 22Last day to drop & receive 100% refundOctober 24Thanksgiving Holiday: No Live SessionsNovember 26 through 28Classes EndDecember 12Grades DueDecember 16